varpa: initial public commit

1 files changed, 78 insertions, 0 deletions

diff --git a/firmware/src/module/gate.c b/firmware/src/module/gate.c
new file mode 100644
index 0000000..b143eab
--- /dev/null
+++ b/firmware/src/module/gate.c
@@ -0,0 +1,78 @@
+/**
+ * 
+ * Author: Dylan Muller
+ * Copyright (c) 2025 
+ * All rights reserved.
+ * 
+ * - Commercial/IP use prohibited.
+ * - Attribution required.
+ * See License.txt
+ *
+ */
+
+#include "setup.h"
+
+#include "driver/mcp3202.h"
+#include "driver/mcp4725.h"
+
+#include "module/gate.h"
+
+#include "util.h"
+#include "status.h"
+
+#include <avr/interrupt.h>
+#include <util/delay.h>
+
+extern t_gate_status gate_status;
+extern t_system_status system_status;
+
+uint16_t gate_probe(
+    uint16_t target_amp,
+    uint16_t* probe_result
+)
+{
+    uint16_t probe_volt = 0x0;
+    uint16_t drain_amp = 0x0;
+    uint16_t gate_count = 0x0;
+    uint16_t drain_count = 0x0;
+
+    system_status.status = SYSTEM_STATUS_BUSY;
+
+    util_volt_to_count(GATE_PROBE_DRAIN, &drain_count);
+    util_volt_to_count(GATE_PROBE_START, &gate_count );
+    
+    dac_write(MCP4725_ID_GATE_VOLT, gate_count, 0);
+    _delay_ms(TRANSACT_DELAY_MS);
+    dac_write(MCP4725_ID_DRAIN_VOLT, drain_count, 0);
+    _delay_ms(TRANSACT_DELAY_MS);
+
+    while((drain_amp < target_amp) && probe_volt < GATE_PROBE_LIMIT)
+    {
+        gate_count += GATE_PROBE_INC;
+        dac_write(MCP4725_ID_GATE_VOLT, gate_count, 0);
+        _delay_us(GATE_LOOP_DELAY_US);
+        
+        drain_count = adc_read(MCP3202_ID_DRAIN_AMP, 0);
+        util_count_to_volt(drain_count, &drain_amp);
+        util_count_to_volt(gate_count, &probe_volt);
+    }
+
+    _delay_ms(TRANSACT_DELAY_MS);
+    drain_count = adc_read(MCP3202_ID_DRAIN_AMP, 0);
+    util_count_to_volt(drain_count, &drain_amp);
+
+    if(GATE_PA_POWER_DOWN)
+    {
+        _delay_ms(TRANSACT_DELAY_MS);
+        dac_write(MCP4725_ID_DRAIN_VOLT, 0, 0);
+    }
+
+    gate_status.q_amp = drain_amp;
+    gate_status.q_volt = probe_volt;
+
+    *probe_result = probe_volt;
+
+    system_status.status = SYSTEM_STATUS_IDLE;
+
+    return drain_amp;
+}